Re: [RFC PATCH 08/12] mm: use mirrorable to switch allocate mirrored memory

[Dave Hansen]

On 06/04/2015 06:02 AM, Xishi Qiu wrote:
> Add a new interface in path /proc/sys/vm/mirrorable. When set to 1, it means
> we should allocate mirrored memory for both user and kernel processes.

That's a pretty dangerously short name. :)

How would this end up getting used?  It seems like it would be dangerous
to use once userspace was very far along.  So would the kernel set it to
1 and then let (early??) userspace set it back to 0?  That would let
important userspace like /bin/init get mirrored memory without having to
actually change much in userspace.

This definitely needs some good documentation.

Also, if it's insane to turn it back *on*, maybe it should be a one-way
trip to turn off.
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